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What is the di-electric constant for conductor layers and planes while defining layerstackup?
At first it seems somewhat counterintuitive that a metal layer has a dielectric constant but the dielectric constrant of signal layers should be the same as that of the adjacent pre-preg layer. The pre-preg fills in the places where there is no copper on the routing layers and so the dielectric constant does make a difference in the impedance and prop delay values. It should be the same for plane layers even though it doesn't really matter if they are solid planes.