The average separation between stacked lamellar crystals, usually measured by small-@A00346@ X-ray or @N04116@ @D01711@.
Source: Purple Book, 1st ed., p. 82 [Terms] [Book]
Citation: 'long spacing' in IUPAC Compendium of Chemical Terminology, 3rd ed. International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. https://doi.org/10.1351/goldbook.L03624 RISBibTexEndNote