  We present $\beta$-FeSe magnetotransport data, and describe them
theoretically. Using a simplified microscopic model with two correlated
effective orbitals, we determined the normal state electrical conductivity and
Hall coefficient, using Kubo formalism. With model parameters relevant for
Fe-chalcogenides, we describe the observed effect of the structural transition
on the ab-plane electrical resistivity, as well as on the magnetoresistance.
Temperature-dependent Hall coefficient data were measured at 16 Tesla, and
their theoretical description improves upon inclusion of moderate electron
correlations. We confirm the effect of the structural transition on the
electronic structure, finding deformation-induced band splittings comparable to
those reported in angle-resolved photoemission.
