On a PC board is the first dielectric layer looking into the board from the top or the bottom layer of copper always prepreg or can it be a core? Here "can" would mean conventional. If not then why?
I asked this leaving work for the weekend. This week I asked the board house this question and they said generally prepreg is always used under the outer layers. I didnt ask why though. If no one will do it then the why doesnt really matter.
Answer
It can be done either way, but conventionally the surface layers are copper foil over prepreg.
Here are two different ways to do a 6-layer board:
The one on the right is the standard stackup style of every board house I've used.
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