This standard specifies a method for the measurement of the thickness of thin, highly reflective coatings (up to 2 µm) by the use of Fizeau multiple-beam interferometry.
DS/EN ISO 3868:1995 history
1995DS/EN ISO 3868:1995 Metallic and other non-organic coatings - Measurement of coating thicknesses - Fizeau multiple-beam interferometry method