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+// Chapter 5 additional Example 15

+//==============================================================================

+clc;

+clear;

+

+//input data

+r   = 1.246*10^-10;     // atomic radius in m

+h1  = 1                 // miller indice

+h2  = 2                 // miller indice

+k0  = 0                 // miller indice

+k1  = 1                 // miller indice

+k2  = 2                 // miller indice

+l0  = 0                 // miller indice

+l1  = 1                 // miller indice

+

+// Calculations

+a    = (4*r)/sqrt(2);    // lattice constant

+d111 = a/sqrt((h1^2)+(k1^2)+(l1^2)); // interplanar distance

+d200 = a/sqrt((h2^2)+(k0^2)+(l0^2)); // interplanar distance

+d220 = a/sqrt((h2^2)+(k2^2)+(l0^2)); // interplanar distance

+

+// Output

+mprintf('d111 = %3.3e m\n d200 = %3.4e m\n d220 = %3.3e m\n',d111,d200,d220');

+//==============================================================================