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Simulations of acoustic wavefields in inhomogeneous media are always performed on finite numerical domains. If contrasts in reality extend over the domain boundaries of the numerical volume, unwanted, unphysical reflections off the boundaries will occur. One technique to suppress these reflections is to attenuate them in a locally and reflectionless absorbing boundary layer enclosing the spatial computational domain, a Perfectly Matched Layer (PML). This technique is commonly applied indoi:10.1109/tuffc.2011.1908 pmid:21622063 fatcat:wldmzxn5cvbfvmdeivg3wcsmli