Hi Eddy,
Is delamination your only problem or do you see other failure modes as well?
Given the thinner than expected PCB and the delaminations, my of hand guess
would be that you squeezed too much resin from your prepreg layers and now
have a resin-starved lamination. Check your lamination pressure. And check it
and the whole lamination precess with your prepreg supplier.

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com

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