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How to read IPC-6012b microsection with plated up copper

2006

I know this sounds very un-informed but what is reality. I would like some advice on a question that's been bothering me.
When you have 1 oz copper inner to start and you plate up to 2 oz. (add 1 oz) Do you follow the IPC table 3.7, for 2 oz and expect that the plating thickness should be .002193?

Or, if I follow the table for 1 oz plus 1 oz added minus the variable process, I get.000980 x 2=.001960? Which is correct?

Terrie Black
QAM, printed circuit board mfg. - Seattle, Washington

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