We present a model for the c-axis resistivity p. in the cuprates which
incorporates interplanar disorder. Higher-order perturbative calculat
ions demonstrate that this special disorder stabilizes a low-T metalli
c state and in the dynamical limit leads to temperature-dependent slop
es drho(c)/dT which are negative (positive) for low (high) hole concen
trations. Predictions are presented for correlations which associate a
nonlinear planar resistivity with the magnitude of negative drho(c)/d
T.