where the function B , shown in Fig. 10, gives the mobility enhancement when including beyond-nearest-neighbor hops. The enhancement depends only on the wave function decay length, expressed in units of a : This result is valid for any shape of the DOS. For the case of a Gaussian DOS with a width (standard deviation) , the mobility is given by: MMA = with = 0.562 (determined numerically for the limit of a large disorder parame ter / k$_{B}$T) and with $_{,}$/MMA dimensionless function of the disorder parameter and