The phrase "a top tier of" is correct and usable in written English.
It can be used to describe a high level or quality of something, often in a competitive context.
Example: "The company is known for its top tier of customer service, setting the standard in the industry."
Alternatives: "a high level of" or "a premier group of".
He leaned over to remove a top tier of chains.
Stern's sat in a top tier of the city's department stores.
It argued that "recreating a top tier of selective grammar schools would be retrograde... divisive and bad for overall standards".
Hundreds of firms were named, and the research team crunched the results to get the final 200, with a top tier of the three firms most often commended across each of 31 practice areas.
The vogue for such specialties is part of a migration of a top tier of American medical students from branches of health care that manage major diseases toward specialties that improve the life of patients — and the lives of physicians, with better pay, more autonomy and more-controllable hours.
The event is designed to boost those who the Koch brothers consider to be in "a top tier of candidates" who, in the words of one person familiar with the efforts of the Koch network, "are most likely to elevate a serious debate on the principles of freedom".
With unlimited plans disappearing, many people buy a top tier for peace of mind — that way, they know they will not run over and incur expensive penalties.
BP is a top tier sponsor of the 2012 Games.
As a top tier supporter of HTML5, Intel is ideal in this respect.
But lower returns also mean any firm with pretensions of being a top tier player (in other words, all of them) will want the best people.
Consequently, Walker was catapulted from political obscurity to a top tier Presidential candidate because of this single issue.
