  We revisit model calculations of the anomalous Hall effect (AHE) and show
that, in isotropic Rashba-coupled two-dimensional electron gas (2DEG) with
pointlike potential impurities, the full solution of the semiclassical
Boltzmann equation (SBE) may differ from the widely-used $1/\tau^{||}$ &
$1/\tau^{\perp}$ solution [Phys. Rev. B 68, 165311 (2003)]. Our approach to AHE
is analogous to the SBE-based analysis of the anisotropic magnetoresistance
leading to an integral equation for the distribution function [Phys. Rev. B 79,
045427 (2009)] but in the present case, we reduce the description to
band-index-dependent transport relaxation times. When both Rashba bands are
partially occupied, these are determined by solving a system of linear
equations. Detailed calculations show that, for intrinsic and hybrid skew
scatterings the difference between $1/\tau^{||}$ & $1/\tau^{\perp}$ and the
full solution of SBE is notable for large Fermi energies. For coordinate-shift
effects, the side-jump velocity acquired in the inter-band elastic scattering
process is shown to be more important for larger Rashba coupling and may even
exceed the intra-band one for the outer Rashba band. The coordinate-shift
contribution to AHE in the considered case notably differs from that in the
limit of smooth disorder potential analyzed before.
