Effective Lorentz Force due to Small-angle Impurity Scattering:   Magnetotransport in High-Tc Superconductors
  We show that a scattering rate which varies with angle around the Fermi surface has the same effect as a periodic Lorentz force on magnetotransport coefficients. This effect, together with the marginal Fermi liquid inelastic scattering rate gives a quantitative explanation of the temperature dependence and the magnitude of the observed Hall effect and magnetoresistance with just the measured zero-field resistivity as input. 
C.M. Varma, Elihu Abrahams