Do you have a signal trace sandwiched between the two dielectric layers,
which is then sandwiched between planes? This is similar to microstrip
or surface-layer etch.
Or are the two dielectric layers both to one side of the signal trace?
Either way, the exact answer depends on the dimensions.
> I have a question regarding the effective dielectric of two layered
> materials (such as ceramics, etc.). For example, say I have two
> with dielectric constants of 4 and 7. When a signal passes through
> two materials, what is the effective or total dielectric constant that
> sees. Any help on this matter is greatly appreciated.