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It is argued that in the limit of extreme disorder AC hopping is dominated by"percolation paths". Modelling a percolation path as a one-dimensional pathwith a sharp jump rate cut-off leads to an expression for the universal ACconductivity, that fits computer simulations in two and three dimensions betterthan the effective medium approximation.Comment: 6 postscript figure

Effective one-dimensionality of universal ac hopping conduction in the extreme disorder limit