  Laser-interferometric gravitational wave detectors are commonly modeled as
being at rest in transverse-traceless coordinates (and thus geodesic). In this
paper, we analyze what happens if the interferometer is mounted on a material
that can undergo elastic oscillations caused by the gravitational wave. We thus
compute the response of a two-dimensional elastic material to linearized
gravitational radiation and compute the resulting response of a laser
interferometer, mounted on such a plate.
