Final answer:
Surface layers refer to the outermost layers of atoms or molecules of a substance or material, and their arrangement or composition can have different properties compared to the bulk of the material.
Step-by-step explanation:
In chemistry, surface layers refer to the outermost layers of atoms or molecules that make up a substance or material. These layers can have different properties compared to the bulk of the material.
The term non-k, OK, PK are commonly used in chemistry to describe the arrangement or composition of these surface layers. For example, in the context of catalysis, the surface of a catalyst may have active sites that allow for chemical reactions to occur.
These active sites can be modified to enhance the efficiency of the catalyst, and the arrangement of atoms or molecules at the surface plays a critical role in catalytic activity. So understanding the surface layers of materials is important in fields like chemistry and materials science.