Semi-additive makes use of a very thin copper on a base. The copper need not
be electroless. Gould makes a copper sputtered (vacuum process) onto
polyimide which is available in very thin copper.  The advantage of
semi-additive is that very fine lines and spaces are possible. The
electrodeposited lines on the thin copper will be confined by the photoresist
and have no undercut.
Jerry Sallo
Sallo Consulting Services
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