How thick was the veil at the Holy of Holies in the Tabernacle?

The Bible gives the dimensions of the cloth, length and width, but not the materials thickness.

The tabernacle was situated in the rear or western half of a courtyard 75 feet wide and 150 feet long. Surrounding the courtyard was a curtained fence made of linen, seven and a half feet high. It was supported by copper posts with pegs of silver. Its entrance was on the east side, being guarded by a thirty-foot gate or screen, beautifully decorated.—Ex. 27:9-19.
The entrance faced east and was divided by five posts behind which hung a curtain colorfully embroidered. Dividing the larger Holy from the Most Holy were four posts behind which hung a similar curtain or veil. Four coverings protected the tabernacle from the weather as well as the eyes of the curious. The first was of embroidered wool and linen, the second of camel’s hair, the third of ram skins dyed red, and the fourth of sealskins.—Ex. 26:1-14, 31-34.

Exodus Chapter 26 says:
26 “And the tabernacle you are to make of ten tent cloths, of fine twisted linen and blue thread and wool dyed reddish purple and coccus scarlet material. With cherubs, the work of an embroiderer, you will make them. 2 The length of each tent cloth is twenty-eight cubits and the width of each tent cloth is four cubits. There is one measure for all the tent cloths. 3 Five tent cloths are to form a series with the one joined to the other, and five tent cloths a series with the one joined to the other. 4 And you must make loops of blue thread upon the edge of the one tent cloth at the end of the series; and you are to do the same upon the edge of the outermost tent cloth at the other place of junction. 5 You will make fifty loops on the one tent cloth, and fifty loops you will make on the extremity of the tent cloth that is at the other place of junction, the loops being opposite one to the other. 6 And you must make fifty hooks of gold and join the tent cloths one to the other by means of the hooks, and it must become one tabernacle.
7 “And you must make cloths of goat’s hair for the tent upon the tabernacle. You will make eleven tent cloths. 8 The length of each tent cloth is thirty cubits, and the width of each tent cloth is four cubits. There is one measure for the eleven tent cloths. 9 And you must join five tent cloths by themselves and six tent cloths by themselves, and you must fold double the sixth tent cloth at the forefront of the tent. 10 And you must make fifty loops upon the edge of the one tent cloth, the outermost one in the series, and fifty loops upon the edge of the tent cloth at the other place of junction. 11 And you must make fifty hooks of copper and put the hooks in the loops and join the tent together, and it must become one. 12 And what remains over of the cloths of the tent is an overhanging. Half of the tent cloth that remains over is to hang over the back of the tabernacle. 13 And the cubit on this side and the cubit on that side in what remains over in the length of the cloths of the tent will serve as an overhanging on the sides of the tabernacle, to cover it on this side and on that".

It was about 5 inches thick. According to Prophecy teachers.