What is the test for reviewing a sentence based on the "deferential abuse of discretion" standard?

Generally, "[t]his court reviews the procedural and substantive reasonableness of a sentence under a deferential abuse-of-discretion standard." United States v. Richardson, 958 F.3d 151, 153 (2d Cir. 2020) (internal quotation marks and brackets omitted). Where, as here, a defendant did not object to his sentence below, we review for plain error. United States v. Erskine, 717 F.3d 131, 135 (2d Cir. 2013).