Don't have the study info or data, so I guess this posting is useless unless
you consider:

Did this thing in the early 1970's when I was an up and coming process
engineer. The customer was HP and they required no lands and 1.5 mils of
copper in the holes (thereby providing lands), minimum, plated with
electrolytic gold. I was at Xerox Pomona (87,000 square foot PCB fab shop)
and we built hundreds of thousands of this MLB type with no hole failures in
up to 8 layer boards. Gold was under $32/oz. Tom Miller and the gang set out
to ruin most of us for even wanting to do the boards they did in house
(vertically integrated in those days - how time changes everything).

Your desire to save real estate is a good one. Just make sure the copper
thickness is there and the ductility is high.

MoonMan

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