hello Jim,

Quick thought for flex...
Use .002 1/1 or half over half adhesiveless
Use .001 cover coat (Polyimide Kapton)
Termination of cover coat .025-.075 at rigid junction requires this area to
be via free for .10 inch... thats a tuff one I know
Traces only perpendicularly transition rigid flex
Traces only perpendicularly transition rigid flex
Relieved planes in flex are very nice for flexing
No adhesive between flex pairs
Either epoxy or poly rigid works
complex flex will require preheat and a fixture after assembly for shape
forming

If your doing FR4 flex things are different
I love flex

Boston Brad

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