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\$\begingroup\$I think "field" in this case has a meaning more like "soccer field" than "electric field" since it says it is the area between devices.\$\endgroup\$
\$\begingroup\$field is an adjective in this usage ... it appears to be similar to farming ... field soil on which crops are grown (type of soil) ... field oxide on which interconnect lines are deposited\$\endgroup\$
field
is an adjective in this usage ... it appears to be similar to farming ...field soil
on which crops are grown (type of soil) ...field oxide
on which interconnect lines are deposited \$\endgroup\$