A Hull/Debye-Scherrer pattern is made with Cu K radiation of AuCu3 quenched from a temperature T1. The ratio of the integrated intensity of the 420 line to that of the 421 line is found to be 4.38. Calculate the value of the long-range order parameter S at temperature T1. (Take the lattice parameter of AuCu3 as 3.75 . Ignore the small difference between Lorentz-polarization factors for these two lines and the corrections to the atomic scattering factors mentioned in section 10-10.)

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