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(a) A disk of radius R rotating at a constant angular velocity Ω within a monolayer of surface shear viscosity ηs. (b) Surface velocity us follows (3.100) when subphase-dominant (Bq ≪ 1, blue squares) and (3.101) when interface-dominant (Bq ≫ 1, green circles); adapted from Zell et al. (2014).
