Specs from laminate manufacturers show a substantial difference in
coefficient of thermal expansion between X-axis and Y-axis for FR4, FR2,
CEM3, CEM1, etc. Is there any way I can tell from a finished PCB which is X
and which is Y? How can I specify in my PCB drawing such that a fab. house
always orientates my PCB in a particular axis? I consider this as a mean to
match with the CTE of certain components on that PCB.

Thanks!
K.K.Chin

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