The far-field scattering response of a side drilled hole in single/layered anisotropic media in ultrasonic pulse-echo setup

► The far-field 3D scattering response of an SDH in the anisotropic media was derived. ► The solution was based on the Kirchhoff approximation. ► The explicit expression was obtained using the stationary phase method. ► The solutions have been evaluated numerically for various cases. ► Their applications were extended to the multi-layered anisotropic materials.