  The linear response theory is used to describe magnetoresistance oscillations
of short-period unilateral superlattices with strong modulation (or
alternatively arrays of coupled quantum wires). The semiclassical description
of this system fails for strong magnetic fields (magnetic breakdown) and we
employ a simple fully-quantum-mechanical tight-binding model in conjunction
with Kubo's formula instead. The resulting magnetoresistance data nicely
compare to the experiments while the model opens good intuitive insight into
the effects taking place in the system.
