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Curvature - Laytec

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Wafer asphericity (deviation from rotational symmetry)<br />

LiAlO 2<br />

bow: ~40 µm<br />

curvature || flat: 130 km -1<br />

curvature ⊥ flat: 2 km -1<br />

bow: ~30 µm<br />

curvature || flat: 50 km -1<br />

curvature ⊥ flat: 57km -1<br />

� Different curvature parallel and perpendicular to main flat<br />

GaN<br />

� Azimuthal position is unkown during in-situ curvature measurement<br />

due to satellite rotation

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