The scattered and internal field phasors can be expanded in terms of appropriate vector spherical wavefunctions with unknown expansion coefficients, whereas the incident-field phasors can be similarly expanded but with known expansion coefficients. The extended boundary condition method can be used to study plane-wave scattering by an ellipsoid composed of an orthorhombic dielectric–magnetic material whose relative permittivity dyadic is a scalar multiple of its relative permeability dyadic.
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