Scherrer Equation — XRD Peak Broadening & Nanocrystallite Sizing (2D)

This is the 2D counterpart to the 3D Scherrer-equation scene: the same finite-crystal interference (Laue) physics, the same instrumental-broadening convolution, and the same Warren-corrected Scherrer readback, drawn as a flat side-on diagram of the diffracting planes with incident and diffracted beam arrows instead of a rendered 3D lattice. Shrink the crystallite down to a handful of planes and watch the diffraction peak swell from a sharp spike into a broad hill, then compare the size a metrology lab would read back out of that peak against the true size you set.