  We consider a tight-binding model on the regular honeycomb lattice with
uncorrelated on-site disorder. We use two independent methods (recursive
Green's function and self-consistent Born approximation) to extract the
scattering mean free path, the scattering mean free time, the density of states
and the localization length as a function of the disorder strength. The two
methods give excellent quantitative agreement for these single-particle
properties. Furthermore, a finite-size scaling analysis reveals that all
localization lengths for different lattice sizes and different energies
(including the energy at the Dirac points) collapse onto a single curve, in
agreement with the one-parameter scaling theory of localization. The
predictions of the self-consistent theory of localization however fail to
quantitatively reproduce these numerically-extracted localization lengths.
