We have also investigated a single crystal (FCC) interconnect line having {111} surface structure with 45 degrees tilt angle. The Gaussian shape hillock on this plane regardless the intensity of the electron wind shows very unstable behavior. Immediately after it is exposed to the electron wind, the oscillatory waves are produced in both directions. As illustrated in Fig. (4.1.13) these waves grow, while they are drifting towards the cathode end. The anode end shows very much depletion at very high electron wind intensities. This may be due to limited size of the interconnect length adopted in the present simulations experiments in order save the computation time.