The phrase "a more marginal" is correct and usable in written English.
It can be used when discussing something that is less central or significant in a particular context or situation.
Example: "The study focused on a more marginal aspect of the issue that had not been previously explored."
Alternatives: "a less central" or "a more peripheral".
"That's why in Europe the selling of street papers is comparatively a more marginal phenomenon".
Farhi, now Lady Hare through marriage to the playwright David Hare, continued in a more marginal role.
Successful trials also typically address an important problem, as opposed to a more marginal one, and involve experienced investigators and patient advocates who push for participation.
But in recent weeks, militias associated with Mr. Sadr and a more marginal Islamist sheik, Mahmoud al-Hassani, have grown increasingly belligerent.
While Lind has recently become a more marginal figure, his story of cultural Marxism has proved durable and useful across the spectrum of right-wing thought because it offers so much.
Regarded as a modern master in Europe, on a par with Buñuel, Dreyer and Bresson (filmmakers to whom he is sometimes compared), Mr. Oliveira is a more marginal figure in the United States.
The polls are stubbornly similar: little budget 'bounce'; little reaction to 'Two Shredded Wheat' Cameron but the smaller parties looking just a bit more marginal, a bit more irrelevant?
This was a far more marginal decision, the striker's front foot just barely beyond the defensive line when he was played through by Mirko Vucinic.
It occupies similar territory, in that it concerns young people coming of age in South Wales, although this time in a remoter, more marginal land.
The Falls City on display in the courthouse during the trials of Thomas Nissen and John Lotter was a meaner, more marginal segment of the community than the Chamber of Commerce might have chosen to emphasize.
Yet the presidency is a much more marginal affair than the congressional races: witness how Mr Bush has cosseted West Virginia with steel tariffs.Both parties, besides, have something to prove.
