Sketch an array of squares of length af on a sheet of paper. On a second sheet of paper sketch a second array of squares of length as (as > af). Tilt these sheets relative to each other to create an interface along which corners of both sets of squares are coincident. Measure the involved angles. Do they agree with Eq. 8-22 Justify your answer. EQUATION 8-2 IS GIVEN BELOW (1 + 1)- cos x = cos(a - Ad) here With a tilt of angle Aa both film and substrate planes will essentially periodically coincide they intersect at the interface. For a lattice misfit off, elementary geometry reveals this will happen when