The term "copper weight" for printed circuit boards does not directly denote a particular copper thickness. The "ounce" weight of PCB's refers to pouring one troy ounce of liquid copper into a 12-inch square pan. As it spreads, the copper levels out. The following chart is the approximate thickness of the four relative copper thicknesses. The circuit board itself (called "prepreg" for fiberglass board), is catagorized as either flex, .032" or .064" laminate. (These number can vary a few thousands by different manufacturers.) A quick check of what thickness board you have, compare to a credit card which are right at .030".
