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It is known that the solution of an elastic scattering problem behaves asymptotically like a sum of a spherical P wave and a spherical S wave. This result, as its acoustic counterpart either, is generally proved by way of some integral representation formula, which contains rather complicated terms in the elastic case. We adopt here a diierent viewpoint,(More)
A generalization of Isakov's theorem ((13]) to admissible shapes that include screens with a Robin boundary condition (in which the impedance is also an unknown) is presented. We also establish a characterization that enables us to distinguish the far-eld of plane screens from others. Numerical results using a quasi-Newton method are presented.
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