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Peter,
FR4 copper plated should be perfectly flat.
If bare board, it still should be flat but you can sometimes see that internal structure.
Bertho
From: Peter Sent: Wednesday, May 14, 2014 17:20
I just received my first order of epoxy/glass copper clad (thus far I
have been using 30+ year old phenolic) and the weave pattern is from
the glass is ∗very∗ pronounced on the surface of the copper. Is this
at all common? Have I purchased a low-grade board? I did some
googling, and all I could find in reference to the weave patterns was
in relation to the performance of high-frequency circuits.
Although I am not concerned about high-frequency performance, there is
enough surface irregularity to substantially effect toner transfer.
It actually takes a fair bit of sanding (i.e. I need to start with 100
grit paper) to clean the board up and get things flat.