Depending on the size of the deli slices, approximately 4-5 slices can be yielded from 2 oz.
For reference, an ounce is generally considered to be 28 grams and one slice of deli meat is usually around 20-30 grams. So if you are slicing thin or regular sized deli meat, 4-5 should fit nicely in your 2 oz measure.
When measuring individual servings of thin sliced meat at a deli counter, remember that they measure by weight and not by number of pieces.
Interestingly enough, 2 ounces of sliced deli meat equates to roughly half a cup – which may sound like a lot more but it’s actually quite reasonable given how thin these slices tend to be.
The average thickness for each slice can vary slightly depending upon the style (thin vs regular), type (turkey, chicken, ham etc.), and even the individual who is doing the slicing; however it’s always a good idea to get a gauge by weighing out your desired amount with weighing scales prior to cutting.