For a 4 layers PCB, is it necessary to cover with ground polygon on Layer 1&4 necessary?
I will cover all the empty spaces in the layout with Ground in
simple single or doubled layer PCB.
The stackup of my 4 layers PCB is as fllowing:
Layer 1: top signal
Layer 2: Ground plane
Layer 3: Power plane
Layer 4: bottom signal
Since now I already got a dedicated Ground plane (Layer 2), my question is:
After finished all the routing, for Layer 1 & 4, should I still cover all the emptied space with Ground as well?