planarising layer

mentioned: organic planarizing layer (OPL)
https://doi.org/10.1351/goldbook.09553
Coating used to create a level surface during lithographic processing.
Note: This layer is often organic and may be called an organic planarizing layer (OPL).
Source:
PAC, 2020, 92, 1861. (Terminology of polymers in advanced lithography (IUPAC Recommendations 2020)) on page 1884 [Terms] [Paper]