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We present the quantum-mechanical calculations of the angular dependence of interlayer conductivity σzz(θ) in a tilted magnetic field in quasi-2D layered metals. Our calculation shows that the LL shape is important for this angular dependence. In particular, the amplitude of angular magnetoresistance oscillations (AMRO) is much stronger for the Gaussian LL shape than for the Lorentzian. The ratio σzz (θ = 0) /σzz (θ → ±90• ) is also several times larger for the Gaussian LL shape. AMRO and Zeeman energy splitting lead to a spin current. For typical organic metals and for a medium magnetic field 10T this spin current is only a few percent of the charge current, but its value may almost reach the charge current for special tilt angles of magnetic field. The spin current has strong angular oscillations, which are phase-shifted as compared to the usual AMRO.

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The interplay between angular and quantum magnetoresistance oscillations in quasi-twodimensional metals leads to the angular oscillations of the amplitude of quantum oscillations. This effect becomes pronounced in high magnetic field, when the simple factorization of the angular and quantum oscillations is not valid. The amplitude of quantum magnetoresistance oscillations is reduced at the Yamaji angles, i.e. at the maxima of the angular magnetoresistance oscillations. These angular beats of the amplitude of quantum oscillations resemble and may be confused with the spin-zero effect, coming from the Zeeman splitting. The proposed effect of "false spin zeros" becomes stronger in the presence of incoherent channels of interlayer electron transport and can be used to separate the different contributions to the Dingle temperature and to check for violations from the standard factorization of angular and quantum magnetoresistance oscillations. PACS numbers: 72.15.Gd,73.43.Qt,74.70.Kn, ρ F = m * /π 2 d is the 3D density of states (DoS) at the Fermi level in the absence of magnetic field per two spin components, and the mean squared interlayer electron velocity along interlayer direction is v 2 z = 2t 2 z d 2 / 2 .

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