The phrase "a substantially more" is not correct as it is incomplete and lacks a noun to follow "more." You can use it when comparing quantities or qualities, but it needs to be part of a complete phrase.
Example: "This solution offers a substantially more effective approach to the problem."
Alternatives: "a significantly greater" or "a considerably higher".
In the case of innovation policy, this structured policy process facilitated a shift to a substantially more interventionist policy.
Supernatural's version of Lucifer is a villain, but not a substantially more threatening one than anyone else who crosses the Winchesters.
He said he was so concerned that he was thinking of joining relatives in Afghanistan – a substantially more dangerous place than the leafy suburban streets of Islamabad.
In conjunction with the newly ordained relevancy prong, the reliability criteria form a substantially more robust framework with which to analyze given scientific testimony.
Moreover, some people close to AOL Time Warner say Mr. Parsons has a substantially more conservative assessment of America Online's growth rate than Mr. Case or Mr. Pittman.
But just two years later, Mr. Prince, Mr. Weill's heir, promoted her to a substantially more complex job, chief financial officer.
Listening to In the Silence, you can't help but conclude that the latter path would make him a substantially more interesting artist.
In their retellings of it, ageing narrators, their best days behind them, lament a debased modern world that is humbled by a substantially more wondrous ancient one.
Under the new Data Protection Act 2018, companies can be fined up to €20m (£17m) or 4% of global turnover – a substantially more serious penalty.
This property also distinguishes persistence from heteroresistance, a phenomenon in which a small subpopulation transiently displays a substantially (more than eightfold) higher MIC14 (see Box 1).
The laden cells exhibited a substantially more developed cytoskeleton compared with those on a control scaffold consisting of the same material composition.
