We thank Konstantin Zahariev, Al Plueddemann, Bob Stewart, and Eric D’Asaro for useful discussions. We also thank Bob Weller, Sid Leibovich, and two anonymous referees for helpful comments on a draft of this paper. Rosalie Rutka helped prepare the diagrams. Financial support from Canada’s Natural Sciences and Engineering Research Council and the U.S. Office of Naval Research is gratefully acknowledged.
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