  The effect of electron correlation on the angle dependence of
magnetoconductivity is studied in quasi-one-dimensional organic conductors. We
investigated the effect on the basis of the momentum dependence of both
quasi-particle's lifetime and velocity near the spin-density-wave (SDW). We
found that the momentum dependence of quasi-particle's lifetime mainly governs
the angle dependence of one-dimensional axis magnetoconductivity. On the other
hand, the change in velocity originating from the electron correlation gives
the dominant effects on the angle dependence of the interchain axis
magnetoconductivity. The effect of electron correlation is clarified from the
association of the momentum dependences of lifetime and velocity with the
momentum dependences of commensurate orbitals on a Fermi surface in magnetic
fields.
