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Recent experimental data of anisotropic magnetoresistivity measured in MgB2films have shown an intriguing behaviour: the angular dependence ofmagnetoresistivity changes dramatically with temperature and disorder. In orderto explain such phenomenology, in this work, we extend our previous analyses onmultiband transverse magnetoresistivity in magnesium diboride, by calculatingits analytic expression, assuming a constant anisotropic Fermi surface masstensor. The calculation is done for arbitrary orientation of the magnetic fieldwith respect to the crystalline axes and for the current density eitherperpendicular or parallel to the magnetic field. This approach allows toextract quite univocally the values of the scattering times in the s- and p-bands by fitting experimental data with a simple analytic expression. We alsoextend the analysis to the magnetoresistivity of polycrystalline samples, withan arbitrary angle between the current density and the magnetic field, takinginto account the anisotropy of each randomly oriented grain. Thereby, wepropose magnetoresistivity as a very powerful characterization tool to explorethe effect of disorder by irradiation or selective doping as well as of phononscattering in each one of the two types of bands, in single crystals andpolycrystalline samples, which is a crucial issue in the study of magnesiumdiboride.Comment: 25 pages, 4 figures. in press on The European Physical Journal

Effect of the four-sheet Fermi surface on magnetoresistivity of MgB2