Effective one-dimensionality of AC hopping conduction in the extreme   disorder limit
  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 path with a sharp jump rate cut-off leads to an expression for the universal AC conductivity, that fits computer simulations in two and three dimensions better than the effective medium approximation. 
Jeppe C. Dyre, Thomas B. Schroeder