The Thick Crystal Case

The Laue and Bragg cases will be separately considered, for the approximation 1. 

Therefore, the term sin A Jl + y ] can be replaced with its average, 1/2, and the average of the reflection power becomes  

FIGURE 5.26 The power of reflection in the dififacted direction for the Lane s case for the thick crystal without absorption after Zachaiiasen (1946). 

Taking into account the definition of reflection power (5.115) combined with the relation (5.93), the first branch of the expression (5.131) can be described such as  

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