~0.1 - 0.4 µm
||Human Homo sapiens
||Robbins, Clarence R. Morphological and macromolecular structure, pp.1-62, chapter 1 in the book Chemical and physical behavior of human hair / Clarence R. Robbins.-2nd ed (2002) p.20 2nd paragraph
|| Randebrook, R.J. J. Journal of the Society of Cosmetic Chemists, Vol. 15, No. 12, 691-706 (1964)
||P.20 2nd paragraph: "Macrofibrils: The spindle-shaped macrofibrils in human hair are approximately 0.1 to 0.4 micron in width or diameter [primary source] and comprise a major portion of the cortical cells (see Figures 1-15 and 1-18). Each macrofibril consists of microfibrils (highly organized fibrillar units) and matrix, a less organized structure that surrounds each microfibril. These structures are illustrated schematically in Figure 1-19."