The Gerbers for the EVAL-ADCLK905 board show 17-mil traces for the 50-ohm lines going to and from the chip, and the Gerbers call for RO4003C material. The traces on the actual board, though, are about 8 mils wide. That makes me think the RO4003C layers are 4 mils thick, but RO4003C doesn't seem to be offered in 4 mils (although RO4350B is.) Can you clarify the actual layer stackup that was used to fab this board? Did your board house switch to RO4350B?