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The conductance of a disordered system of finite volume L^d (d spatial dimensions) is calculated by making use of a recently developed self-consistent theory. Scaling equations are derived for the dimensionless conductance g and the scaling function (g (L) ) =dlngdlnL is explicitly calculated for arbitrary dimension d. It is shown that the theory obeys scaling in the sense of Wegner, Thouless, and Abrahams et al.
Vollhardt et al. (Mon,) studied this question.