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Re:RepRap printed circuits by unwind on Tuesday May 29, 2012 @05:43AM (#4036697)
From Wikipedia (http://en.wikipedia.org/wiki/Conductive_polymer#History), reference markers removed:

In 1963 Australians Bolto, DE Weiss, and coworkers reported iodine-doped oxidized polypyrrole blacks with resistivities as low as 1 ohm·cm. This Australian group eventually claimed to reach resistivities as low as 0.03 ohm·cm with other conductive organic polymers. This resistivity is roughly equivalent to present-day efforts.

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