Hi Larry -

We use a materials note that reads somewhat as follows:

# Fabricate goard from laminates and bonding materials conforming to
IPC-4101/**.  Nominal starting copper is 1/2 ounce [153 G/M2] on layers *, *,
*, *, *, * and 1 ounce [306 G/M2] on layers *, *, * and *.   [Cladding type,
if critical, is also spelled out in this note using IPC4101 table 1].

The specifics of layer to layer spacing, allowable etch factors, etc., are all
detailed elsewhere in the drawing notes.

Hope this helps - Kelly

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