The stomach has extra layers of smooth muscle. One function of this is to strengthen the stomach wall. What is another function?

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The extra oblique smooth muscle in the stomach strengthens mechanical digestion by enabling stronger, multidirectional contractions that mix and mash the food. This vigorous mixing, including back-and-forth grinding (retropulsion), breaks the material down and blends it with gastric secretions to form chyme, which is the prep-work needed before it passes into the small intestine. Absorption mostly happens in the small intestine, mucus is produced by glands in the stomach lining rather than by muscle, and gastric emptying is primarily controlled by the pyloric sphincter and feedback from the duodenum, not by this muscle layer alone.