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The scattering from three-dimensional cracks has been analyzed and measured. The crack geometry is a rectangular groove in a perfectly conducting surface. The groove forming the crack may he terminated with an open aperture creating a slit in the conducting surface or with an impedance boundary creating a trough. The scattered fields from a crack were analyzed with two types of scattering mechanisms, a component directly related to the scattered fields from a two-dimensional crack and a traveling wave component. scr'cc' condvc'or /

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