"layer of confidence" is correct and is usable in written English.
You could use the phrase to refer to a person's faith in their abilities or in a situation, for example: "She had gained a layer of confidence from her recent success at work."
Brands add "another layer of confidence to a product where everybody feels so unsure," he said.
Robust technical methods would provide an extremely valuable layer of confidence that does not rely as heavily on trust.
Lawyers need that extra, high level layer of confidence that the laws relied in their opinions, submissions or judgments are up-to date.
As a player, it has to be ridiculously easy to trust Coach Izzo, which just gives you another layer of confidence.
Pyrosequencing is completed in about 60 min (following PCR amplification) and yields accurate and reliable results with an added layer of confidence.
Winning in Melbourne, where he defeated Roger Federer in the semi-finals, has added another layer of confidence to Djokovic's make-up, not that he was short of it before.
In the U.S. alone, a watch is purchased every five seconds on eBay, the company notes, "eBay has the largest selection of luxury goods – from rare and designer handbags to fine wristwatches – and we know this community wants an added layer of trust and confidence when buying in these categories," said James Hendy, Senior Director of eBay Authenticate, in a statement about the launch.
They were clearly the more powerful team and I detected added layers of confidence and belief, drawn, I would suggest, from the outstanding victory over the All Blacks before Christmas.
Ms. Paulson, seen on Broadway in the disappointing recent revival of "The Glass Menagerie" and a star of the short-lived television series "Studio 60 on the Sunset Strip," slowly peels away Meg's layers of confidence and illusion to lay bare the regret and disappointment that haunt her.
Released this year, the debut album, Up to Anything, was described by the Guardian's Everett True in a five-star review as "like living inside a great Australian coming-of-age movie... sun-blinded wonder and trembling insecurities hidden under rapidly shedding layers of confidence".
People who favored the plan said the presence of an armed pilot provided an added layer of safety and confidence.
