Abstract: Aiming at specific guided-wave mode incidence situations, hybrid boundary element modeling is used to estimate reflection and transmission from inclined scatterers. Interaction between individual guided-wave modes and the scatterers is investigated by calculating the reflection and transmission coefficients in the scattered fields for various incident modes, frequencies, and angles of inclination. Results obtained in this paper can be used to improve inspection sensitivity and penetration power for a variety of practical NDE applications, notably those in which thickness variation is present.