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An estimate of the reflection coefficient Rs for spurious waves off the plane wave radiation boundary, for incident plane waves at angle θ is given by the expression:
where N is the order of the boundary condition (here 1 or 2). So at normal incidence (θ = 0) there are no spurious reflections, while, for example, at an incidence angle of 30o for N = 2 (plane wave radiation in the frequency domain) the amplitude of the spurious reflected wave is 0.5 % of the incident.
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