Dielectric-like degradation of thin-film conductors is simulated up to
final breakdown within a biased percolation model. As relevant indica
tors we take the damage pattern, current distribution, resistance vari
ation, failure lifetime and relative resistance fluctuations. The resu
lts show that biased percolation predicts well several known features
taking place close to the abrupt failure of thin films in close agreem
ent with available experimental results. (C) 1998 Elsevier Science Ltd
.