  An active elastodynamic cloak destructively interferes with an incident time
harmonic in-plane (coupled compressional/shear) elastic wave to produce zero
total elastic field over a finite spatial region. A method is described which
explicitly predicts the source amplitudes of the active field. For a given
number of sources and their positions in two dimensions it is shown that the
multipole amplitudes can be expressed as infinite sums of the coefficients of
the incident wave decomposed into regular Bessel functions. Importantly, the
active field generated by the sources vanishes in the far-field. In practice
the infinite summations are clearly required to be truncated and the accuracy
of cloaking is studied when the truncation parameter is modified.
