ah ha! Surface mechanics! “Extrinsic surface states are usually defined as states not originating from a clean and well ordered surface. Surfaces that fit into the category extrinsic are: Surfaces with defects, where the translational symmetry of the surface is broken. Surfaces with adsorbates Interfaces between two materials, such as a semiconductor-oxide or semiconductor-metal interface Interfaces between solid and liquid phases. Generally, extrinsic surface states cannot easily be characterized in terms of their chemical, physical or structural properties.” https://www.sciencedirect.com/science/article/pii/S2542435119305823

ah ha! Surface mechanics!
 
“Extrinsic surface states are usually defined as states not originating from a clean and well ordered surface. Surfaces that fit into the category extrinsic are:
 
Surfaces with defects, where the translational symmetry of the surface is broken.
Surfaces with adsorbates
Interfaces between two materials, such as a semiconductor-oxide or semiconductor-metal interface
Interfaces between solid and liquid phases.
Generally, extrinsic surface states cannot easily be characterized in terms of their chemical, physical or structural properties.”
 
https://www.sciencedirect.com/science/article/pii/S2542435119305823

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