What is the thickness of the inner copper layers?

For a 4 layer stack-up, the inner copper thickness is 0.017mm (0.67mils) per 0.5oz copper.

1oz copper
FR4
0.5oz copper
1.2mm FR4
0.5oz copper
FR4
1oz copper


Inner Layer Copper Thickness (example for 4 layers)0.017mm(0.5oz)0.67mils 

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