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A uniaxial anisotropic material is defined as one whose εy (x) = εz (x) ≠ εx (x). The two permittivities εz (x) , εx (x) (inset) (β (x) and α (x) are the same as in Fig. 1) are designed to ensure that the material exhibits zero reflection at grazing (top) as a result of the material supporting a HBS for both polarisations at grazing incidence (bottom).
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