Fig. 11From: Stability and symmetry of ion-induced surface patterningComparison of the second order curvature term coefficients magnitudes, \(|\hat \nu _{x}|\) and \(|\hat \nu _{y}|\). It can be seen the magnitude of \(\hat \nu _{x}\) is greater than \(\hat \nu _{y}\) for all angles except the range 45°<θ<∼57°Back to article page