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Within a real-space renormalization-group framework based on self-dual clusters, we calculate the conductivity of a square-lattice quenched bond--random resistor network, the conductance on each bond being g₁ or g₂ with probabilities 1-p and p, respectively. The group recovers several already known exact results (including slopes), and is consequently believed to be numerically quite reliable for almost all values of p, and all ratios g₁/g₂ (in particular, g₁=0 and g₁={∞} with finite g₂, respectively, correspond to the insulator-resistor and superconductor-resistor mixtures).
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Costa et al. (1986) studied this question.
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