The phrase "a shallow sheet of" is correct and usable in written English.
It can be used to describe a thin layer of a substance, often in contexts related to water, ice, or other materials.
Example: "The pond was covered by a shallow sheet of ice, making it unsafe for skating."
Alternatives: "a thin layer of" or "a light covering of".
They passed me, crossed a shallow sheet of water, and entered a forest.
When the work was done, a result was a shallow sheet of water moving over a graveled bed.
In general, Texas and the Gulf Coast of the United States may be completely overrun by a shallow sheet of oceanic air, which may continue for a long distance inland.
Often called the "River of Grass," the Everglades once was a 60-mile wide, shallow sheet of water flowing ever so slowly through southern Florida.
In addition, the braided distributary channels also perform some sorting, laying shallow sheets of sand and silt over the surface of the fan, while coarser sands and gravels are laid down in the main channels where water tends to flow more quickly.
The surface area can also be reduced by storing the water in a compartmented reservoir, and pumping the water from one compartment to another as the water is used, so that there are some full compartments and some empty, instead of a single shallow sheet when the reservoir is partly used (Cluff 1981).
Due to the flow characteristics in a GWW, an area of shallow sheet flow on the side-slopes and another of concentrated flow along the thalweg can be identified.
This wetland ecosystem was sustained by the Kissimmee River, flowing through Lake Okeechobee and southwards as a shallow, slow-moving sheet of water flowing freely to the estuaries of Biscayne Bay, Ten Thousand Islands, and Florida Bay.
Place the mushroom toasts on a shallow baking sheet and sprinkle with the grated cheese.
Take out a shallow baking sheet for the plantains.
Place sliced dough just barely touching on a shallow baking sheet.
