I remember working with 'multi-wire' boards, which had layers of wiring
buried in the resin similarly. Heavier wires needed to be buried deeper.
Troubleshooting power 'layers' was a real bear, but it sure was a good thing
the signal wire layers were nearer the surface. ECN's seemed to focus on
them regularly.

CL

> Having signal traces on the inside makes it harder to debug a
> bad board.
>
> Tradition.
>

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