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<p>Compute complex reflection coefficient at a fluid-fluid boundary, given:</p>
<ul>
<li>angle of incidence <code>θ</code> (angle to the surface normal)</li>
<li>relative density of the reflecting medium to incidence medium <code>ρᵣ</code></li>
<li>relative sound speed of the reflecting medium to incidence medium <code>cᵣ</code></li>
<li>dimensionless absorption coefficient <code>δ</code></li>
</ul>
<p>Implementation based on Brekhovskikh &amp; Lysanov. D