Table 2

Angles between the incident ion beam and the normal to the four pyramids' planes for ϕ = 45°.

Ion beam incidence angle α Angle between incident ion beam and normal to the pyramid planes

θ1 θ2 = θ4 θ3
36° 18.7 62.2 90.7
42° 12.7 64.6 96.7
64° 9.3 75.3 118.7

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