  The dependence of the magnetoresistance of quasi-one-dimensional metals on
the direction of the magnetic field show dips when the field is tilted at the
so called magic angles determined by the structural dimensions of the
materials. There is currently no accepted explanation for these magic angle
effects. We present a possible explanation. Our model is based on the
assumption that, the intralayer transport in the second most conducting
direction has a small contribution from incoherent electrons. This incoherence
is modelled by a small uncertainty in momentum perpendicular to the most
conducting (chain) direction. Our model predicts the magic angles seen in
interlayer transport measurements for different orientations of the field. We
compare our results to predictions by other models and to experiment.
