  We study the electron/hole transport in puddle-disordered and rough graphene
samples which are subject to in-plane magnetic fields. Previous treatments,
mostly devoted to regimes where the electron/hole scattering wavelengths are
larger than the surface height correlation length, are based on the use of
transport equations with appropriate forms for the collision term. We point out
in this work, as a counterpoint, that classical Lorentz force effects, which
are expected to hold when the Fermi level is far enough away from the charge
neutral point, can be heuristically assessed through disordered Boltzmann
equations that contain magnetic-field dependent material derivatives, and keep
the zero magnetic-field structure of the collision term. It turns out that the
electric conductivity tensor gets a peculiar nondiagonal component, induced by
the in-plane magnetic field that crosses the rough topography of the graphene
sheet, even if the projected random transverse magnetic field vanishes in the
mean. Numerical estimates of the transverse conductivities suggest that they
are suitable of observation under conditions which are within the reach of
up-to-date experimental methods.
