Calculations are presented of a superlattice effect, observable in sam
ples where most of the scattering is at sharp interfaces. As the layer
thicknesses change, oscillations in the resistivity of up to 100% are
found. These oscillations are due to interface disorder breaking the
degeneracy of certain states, causing them to have nodes at the interf
aces. The states with nodes have high conductivities, leading to a ''s
hort-circuit'' effect. Only for special thicknesses is it possible for
a state to have nodes at all the interfaces. Hence, the oscillations
occur as a function of layer thickness. Spreading the width of the int
erfaces or increasing the ratio of bulk disorder to interface disorder
reduces the effect.