Is anyone aware of an effective method to measure the degree of image
transfer (or "telegraphing") on multilayer panels after lamination (b-stage
and c-stage bonding).  The measurement metric desired is one that can be used
to define acceptability of the panels (pass/fail) for the outer layer dryfilm
process.

It is difficult to improve on a condition if it cannot be measured, and the
pass/fail limits clearly defined.  Anyone familiar with the image transfer
condition, and it's effect on the outer layer imaging process, knows that it
is not just the "depth, or height" of the "telegraphing" - the rate of change
in the surface planarity also is a key factor.

Any input from fabricators and/or dryfilm (or related) suppliers would be
greatly appreciated.

Adam Davies, JJA
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