1. The problem statement, all variables and given/known data A seismic wave travel from surface, is reflected at the fifth of a series of horizontal interfaces. Each has a reflection coefficient "R" of 0.15. What is the total attenuation in amplitude caused by energy partitioning at all encountered interfaces, when the wave returns to the surface? 2. Relevant equations total loss = (1-R)(1+R) = (1-R^2) [for one layer] 3. The attempt at a solution We have a discussion here, where some argue that the equation should be used 4 times, hence the answer is 9% of the amplitude has been attenuated. And some who argue that it should be used 5 times (11.25%). Any inputs as what could be the correct one?