Measure diameter of SEAD ring(R).
Calculate ring radius(r) from R/2.
Measure constant distance (x) of operated camera length.
Calculate D-spacing of sample (Ds) from Ds=(Dc * r)/X nm-1.
Convert the calculated Ds from nm-1 to nm and compare with D-spacing of XRD pattern to identify a diffraction plane (hkl) of the SAED ring.