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The phrase "add an extra layer" is correct and usable in written English.
You can use it when discussing the concept of enhancing or complicating a situation, process, or design by including additional elements or features.
Example: "To improve the security of our application, we decided to add an extra layer of encryption to protect user data."
Alternatives: "include an additional layer" or "introduce a supplementary layer."
Exact(56)
'On the plus side it does add an extra layer of external "credibility".
The indiscriminate attacks on hospitals and civilians – either targeted or conveniently labelled collateral damage – add an extra layer of complexity.
Desperate scrambles for errant body parts add an extra layer of tension to the numerous, and usually impressive, setpieces.
It seems both offensive and clumsy to add an extra layer of fiction to suffering which demands no gratuitous intervention.
I found that disappointing, because the super weapons add an extra layer of strategy to the game.
On Tuesday, McAfee released a new app that lets users add an extra layer of protection to their Facebook photos.
Amsterdam is excellent on the minutiae of family life, so did he really need to add an extra layer of magic?
To be and feel European is not to renounce one's identity; it is, on the contrary, to add an extra layer to it and make it richer.
Similar(3)
The keyboard adds an extra layer of usefulness.
The pointedly un-Disneylike musical soundtrack adds an extra layer of hipness.
But academics have complained that this demand adds an extra layer of bureaucracy.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com