Optical arrangement for thin film (p.63 of textbook) X-ray Detector Collimator <1° Glancing angle Figure 2.16 Optical arrangement for thin film diffractometry. Parallel rather than divergent incident beam Monochromator between incident beam and the sampleOptical arrangement for thin film Glancing angle (p.63 of textbook) • Parallel rather than divergent incident beam • Monochromator between incident beam and the sample