The phrase "an additional tier" is correct and usable in written English.
It can be used when referring to an extra level or layer in a hierarchy, structure, or system.
Example: "The new pricing model includes an additional tier for premium subscribers, offering exclusive benefits."
Alternatives: "an extra level" or "a supplementary tier".
Data grids, used as an additional tier in n-tier architecture of web applications, allow to speed up access to data.
Over the last few months, 99ers have tried to organize to press Congress to provide an additional tier of unemployment insurance.
Frege's (1952) answer to his own puzzle was to add an additional tier, of Sinn or "sense," to the referential semantic value of a name.
In parts of the building, there is a second bench above the first one that forms an additional tier of seating.
EN: Working with private agents adds an additional tier of due diligence.
Sections of the track were removed and relaid at other athletics venues, and the internal ground level was lowered to make way for an additional tier of seating, on terracing already constructed then buried for the original configuration.
The accuracy of imputation is improved using a 3-tiered approach, which used an additional middle tier of 50K, compared to 2-tiered approach, especially when the top panel of animals genotyped with 800K SNPs is small.
The error rate of imputing up to 800K from 3K or 7K was further reduced when an additional middle tier of 50K genotypes was incorporated in a 3-tiered framework.
Over the years, the company added a few additional tiers to the standard storage service.
If you need to host confidential data, you can purchase an additional security tier from Media3.
Is it really an alternative to getting Best Buy's Geek Squad Protection to cover a phone or tablet drop and the resulting cracked screen, only to learn that Geek Squad Protection with Accidental Damage is an additional optional tier – and there's a deductible for device replacement besides?
