Key points are not available for this paper at this time.
The dc conductance of a finite system with static disorder is related to its transmission matrix t by the simple relation = (e^{2}2) Tr (t^t). This relation is derived from the Kubo formula and is valid for any number of scattering channels with or without time-reversal symmetry. Differences between various definitions of the conductance of a finite system are discussed.
Fisher et al. (Mon,) studied this question.