A current density of 6.5 104 mA/lm2 was continually
applied on the samples and the variation in the resistance was collected.
The change in the layer resistance was measured after 30 s,
4 h, 10 h and 18 h. The results shown in Table 1b indicates that for
samples stressed for 18 h, the resistance increased from 8 lO to
8.25 lO for Cu/Ge/Pd/n-GaAs and from 13.5 lO to 13.8 lO for
Cu/Pt/Ti/Pt/p-Ge.