  Evolutions of Geant4 code have affected the simulation of electron
backscattering with respect to previously published results. Their effects are
quantified by analyzing the compatibility of the simulated electron
backscattering fraction with a large collection of experimental data for a wide
set of physics configuration options available in Geant4. Special emphasis is
placed on two electron scattering implementations first released in Geant4
version 10.2: the Goudsmit-Saunderson multiple scattering model and a single
Coulomb scattering model based on Mott cross section calculation. The new
Goudsmit-Saunderson multiple scattering model appears to perform equally or
less accurately than the model implemented in previous Geant4 versions,
depending on the electron energy. The new Coulomb scattering model was flawed
from a physics point of view, but computationally fast in Geant4 version 10.2;
the physics correction released in Geant4 version 10.2p01 severely degrades its
computational performance. Evolutions in the Geant4 geometry domain have
addressed physics problems observed in electron backscattering simulation in
previous publications.
