Square planar complexes of platinum are shown to have high, possibly metallic conductivity along one axis due to overlap between $d_{z^2}$ orbitals of platinum in two valence states. The room-temperature Seebeck effect is small and positive which is interpreted as caused by a degenerate gas of holes.

• Received 9 November 1970

DOI:https://doi.org/10.1103/PhysRevLett.26.371