Defining a surface variable on a domain?

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Hello, I'm attempting to define the reaction rate of a bulk species involved in an adsorption reaction in Transport of Diluted Species. I am also using Chemistry and Surface Reactions. I would like to define this reaction rate as a function of the concentration of the adsorbed species. However, the variable for the concentration of the adsorbed species is defined only on a boundary, not the domain. Is it possible to define this variable across the whole domain?


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