It's actually called a silver eagle; the $1 denomination is artificial. If you look on the back of the coin you'll see it's inscribed with the weight, 1 troy oz (or 31.11 gm) of 999/1000 pure silver.
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There is no silver in a 1972 US half dollar.
There is around .77 ounces in a 1921 US silver dollar.
The amount of pure silver in the 1925 Peace dollar is .77344oz, all US silver one dollar coins from 1840 to 1935 have this much silver in them
Still no 1942 silver dollar US coin. If you mean a 1942 US half dollar it's worth $7.00-$9.00 in circulated condition.
If you mean a real silver dollar, such as a Morgan or peace dollar the thickness is 2.4mm