CREATE TABLE table_49536 ("Outcome" CLOB, "Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents" CLOB, "Score" CLOB)

what is the surface when the opponents are louise field nathalie herreman?
SELECT "Surface" FROM table_49536 WHERE "Opponents" = 'louise field nathalie herreman'
SELECT "Surface" FROM "table_49536" WHERE "Opponents" = 'louise field nathalie herreman'