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Hello Bernie,I'm Kirk from MILSystems, we are currently getting ready to get a board manufactured and found this document laying out how to describe the layers of the PCB"CONSTRUCTION 1.6mm 4 LAYER (FR4) 0.71 35/35 CORE, 18/18 OUTER STD 17/03/2009Item # Specification Name1 0.00mm 17/0 18um COPPER FOIL2 0.18mm 7628 PREPREG4 0.71mm 35/4 FR402 .71mm 35/35 CORE5 0.18mm 7628 PREPREG6 0.18mm 7628 PREPREG7 0.00mm 17/0 18um COPPER FOIL"This is all fine but no one in the office is able to understand watch the "17/0"/"35/4" on the copper layers indicate. If you could shed some light on this it would be very helpful.Thanks for your help.Kind regards,Kirk