The exact analytical expressions for the 2*2 one-way propagator matrices of plane S waves, propagating along the axis of spirality in the simple 1-D anisotropic "twisted crystal" model, are presented. The analytical equations may be useful to test and debug approximate and numerical methods, e.g., the coupling ray theory, the high-order anisotropic ray theory or the finite differences. The exact solution is compared with the analytical equations for the coupling ray theory and zero-order anisotropic and isotropic ray theories.
Anisotropy, S-wave coupling, polarization, elastic waves, exact solution.
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