the welghted average of y, and ys (25). Therefore, T h e resulting interfacial energies ysi and yMf and the interfacial energy difference Ay(f) = yblfysi are shown in Fig. 3, A and B. yxlf = ysf at f = 0.57 2 0.05. T h e uncertainty in f results from uncertainties in http://www.sciencemag.org SCIENCE VOL. 275 7 MARCH 1997
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