[1] Unlike other types of acoustic and electromagnetic surface waves, the DSW's existence is due to the difference in symmetry of materials forming the interface.
Later, similar waves were predicted to exist at the interface between two identical uniaxial crystals with different orientations.
Consequently, numerous potential applications are envisaged, including devices for integrated optics, chemical and biological surface sensing, etc.
A large number of theoretical work appeared dealing with various aspects of this phenomenon, see the detailed review.
For this configuration, the DSW can propagate along the interface within certain angular intervals with respect to the C axis, provided that the condition of εe > ε > ε0 is satisfied.