The phrase "a layer of shell" is correct and usable in written English.
It can be used when describing a physical layer or covering made of shell material, often in contexts related to food, construction, or biology.
Example: "The dessert was beautifully presented with a delicate layer of shell that added both texture and flavor."
Alternatives: "a coating of shell" or "a shell layer".
On the right-hand side, a layer of shells and other inclusions may have been responsible for displacement of the glyph column to the right, but we can suggest no explanation for its further displacement lower down.
Above that interval was a layer of gastropod shell hash grading up into a fine, carbonate-rich mud.
Preformed CdS nanowires with a diameter of ca. 45 nm and a length up to several tens of micrometers were coated with a layer of ZnS shell by the reaction of zinc acetate and thiourea at 180 °C for 10 h.
The emission spectrum of the SrF2 3Dy core is weak due to the strong cross relaxation amongst the Dy3+-Dy3+ ions, which has been overcome by covering a layer of CaF2 shell over SrF2 3Dy (i.e., core@shell formation).
Add a layer of oyster shells on top before filling the hole with soil.
Si nanoparticle was coated with a layer of porous carbon shell with rationally designed void in between which provides the accommodating space for the volume change of Si over cycling.
In addition, we further engineered the GelMA microgels by providing a layer of silica hydrogel "shell" in order to protect the cells cultured on GelMA microgels from harmful external environment such as oxidative stress during injection and implantation.
In the macroscale, the sandwich panel is discretized with an equivalent single layer of shell elements.
Rimantidine is believed to attack a layer of the virus's shell.
Atop a layer of Manila clams, each shell open just enough to display the tasty contents within, lay a spiky Fideo crown, the short thin noodles bespangled with jewels of chorizo, each strand shining with a coating of melted porcine fat.
