Exercises 15.2: About the "burgers" model

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A) . . . . B) .

15.2.1 The two figures above correspond to an overlayer problem with the blue overlayer having a different lattice constant (c) from that (a) of the red substrate.

A) If the coupling among the blue atoms is the SAME for both figures, for which is the coupling of the blue atoms to red atoms of the substrate the stronger?

B) What is the c/a ratio for both figures?