The phrase "a rich layer of" is correct and usable in written English.
It can be used to describe something that has depth, complexity, or a variety of elements, often in a metaphorical sense.
Example: "The novel offers a rich layer of themes that explore the human condition."
Alternatives: "a deep layer of" or "a complex layer of".
"You have to go through a rich layer of blood vessels beneath the retina to get the prosthesis in contact with the nerve tissue".
All of which added a rich layer of subtext to Mr. Marsalis's spectacular early career, underscoring jazz's natural cycle of mentorship and apprenticeship.
The small barrels impart a rich layer of smooth, oaky flavor to the wine — to the delight of some consumers and the outrage of purists, who see oak flavors as inimical to the traditions of Montalcino and Brunello.
Overwolf is a software client that adds a rich layer of functionality to games, without touching the game code.
Along with small fossils such as pollen, seeds, insects, and snails, the team's recent diggings have brought to light a rich layer of fossils of bats, songbirds, dodos, and extinct giant tortoises.
In today's issue of Nature, geochemist Kenneth Farley of the California Institute of Technology in Pasadena and colleagues report finding a rich layer of cosmic particles in ocean sediments marking such a dust-producing event.
In addition to cowriting three of the songs on Surprise, Eno was credited with creating the album's "sonic landscape"—a rich layering of electronic instrumentation and rhythms that complemented Simon's lyrics.
Before you see "Tempo de Verão" (Summertime), you hear it, as a rich layering of birdcalls fills the darkened stage at Dance Theater Workshop, from songbirds' trilling announcements to the mournful cooing of doves.
For more than 5,000 years, farmers have worked the land along the Nile and in the Nile Delta, the lotus-shaped plain north of Cairo where centuries of accumulated silt have produced a deep, rich layer of topsoil.
The birds return to the same place each summer to mate, and because about one in four chicks die on the spot, a rich layered record of the populations goes back for millennia.
Moreover, micro-Raman spectroscopy studies indicate the existence of graphitic rich layer of a-C in the coating which limits the columnar growth on account of a-Si.
