The amorphized surface of Si( 100) sputtered with low energy ions at moderate temperature was found to develop two perpendicular ripple patterns overlaying each other. The evolution of these patterns was studied over a wide range of fluence. Coarsening of both ripple modes was observed, showing a similar time dependence with a coarsening exponent of n similar to 0.08. In the high fluence regime, the surface enters a steady state with both ripple modes still present.
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