Let's say you want to create this stackup shown below:
View attachment 118378
There are two ways you can do this:
(1) If you define M1 and M2 as "
intrude" then dielectric
layer thickness must be defined as
2µm, which is the distance from the
bottom side of M1 to the
bottom side of M2.
(1) If you define M1 and M2 as "
expand" then dielectric
layer thickness must be defined as
1µm because each metal will automatically expand (grow) the dieelectric layer by the metal thickness. If the metals are set to "expand" then you define the dielectric layer thickness as the distance between the two metals (here: 1µm between top of M1 to bottom of M2)