planar film

https://doi.org/10.1351/goldbook.P04683
A @[email protected] whose boundaries are represented by ideal parallel planes. The planar @[email protected] thickness is defined as the distance between these planes. The terms nanometre @[email protected], micrometre @[email protected] and millimetre @[email protected] refer specifically to @[email protected] thickness in the ranges \(0.1-100\ \text{nm}\), \(0.1-100\ \unicode[Times]{x3BC}\text{m}\) and \(0.1-100\ \text{mm}\), respectively.
Source:
PAC, 1994, 66, 1667. (Thin films including layers: terminology in relation to their preparation and characterization (IUPAC Recommendations 1994)) on page 1671 [Terms] [Paper]