The phrase 'lower surface of the' is correct and usable in written English.
For example, you could write: "The lower surface of the stone was cold and smooth to the touch."
Setae generally arise from the ventral (lower) surface of the body.
The hard lower surface of the head is called the gula (hypostomal bridge).
The board said this evening that in the past two days, searchers had found "what appeared to be a panel from the lower surface of the right wing and a piece of the lower forward fuselage".
The tips of these branches are embedded in small concavities on the lower surface of the basal cells of the epidermis.
The upper, closed end, called the crown, forms the lower surface of the combustion chamber and receives the force applied by the combustion gases.
The surfaces of the forehead, cheeks, and nose are normally oily, in contrast with the relatively greaseless lower surface of the chin and jaws.
The pharynx, with its many gill slits, is surrounded by the atrium, a large cavity with a single exit (the atriopore) on the lower surface of the body.
We also implement interfaces representing the lower surface of the subducting PAC and PHS plates.
Tuberous roots developed on the lower surface of the rockwool slabs.
The retroperitoneal fat was easily separated from the lower surface of the transversalis fascia by digital adhesiolysis.
The remaining lower surface of the body is dark, brown or reddish.
