| http://www.w3.org/ns/prov#value | - In one embodiment, the channels have depths in the range of about 12.5 to 75 ??m ( 0.5 to 3 mils), and preferably about 25 to 50 ??m (1 to 2 mils). [0080] The conductive traces are typically formed using a conductive material 56 such as carbon (e.g., graphite), a conductive polymer, a metal or alloy (e.g., gold or gold alloy), or a metallic compound (e.g., ruthenium dioxide or titanium dioxide).
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