This will depend on how the cross hatch is done. If the cross hatch is
square and the traces are routed directly above/below the hatch then
a 2d field solver can be applied and get good answers. However if the
cross hatch is diamond w.r.t. the traces then more work is necessary to
get a reasonable result from a 2d field solver. Electrically speaking
the square cross hatch is a better solution. However for manufacturing
and mechanical reasons flex is usually made with diamond cross hatching.
That being the case, care has to be taken to make sure the return paths
are not being increased substanually due to the hatching. And as
mentioned its much harder to model.
-- Fred Balistreri email@example.com
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