💎 Bragg Diffraction from Crystal Planes: Path Difference, Phasors and theta-2theta Scan (2D)

Cross-section of a crystal with parallel atomic planes: X-rays reflect from every plane and add up only when the path difference is a whole number of wavelengths. Same N-plane kinematic model as the 3D page, with the phasor sum, a live scan, peak-width and Debye-Waller checks.