# Translations:Reflection coefficients and transmission coefficients/3/en

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A reflector is characterized by a contrast in acoustic impedance, which gives rise to a seismic reflection (O’Doherty and Anstey, 1971^{[1]}). *Reflectivity* refers to the reflection coefficient. The amplitudes that are required in the definitions of reflection and transmission coefficients can be obtained by solving equations that express the continuity of displacement and stress at the boundary. We consider the case of normal incidence on an interface separating two media of densities and and velocities and . The impedances are, respectively, and . Let an incident downgoing wave in a formation with impedance strike a formation with impedance (Figure 1).

- ↑ O’Doherty, R., and N. Anstey, 1971, Reflection on amplitudes: Geophysical Prospecting,
**19**, 430–458.