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SH images of the tetrapod with different orientations relative to the polarization of the fundamental excitation. The polarization of the fundamental wave is kept vertical. The tetrapod is rotated 30° clockwise per step from (a) to (d). The orientation of leg 1 starts to be perpendicular to the fundamental wave’s polarization and ends parallel to that (reprinted with permission from Ref. 172, Copyright 2009, American Chemical Society).
