Depending on the thickness of the slices of turkey, you can expect to get 3 to 4 slices from 2 ounces. If the slices are thin, you could even get up to 5 slices, but for an average thickness it would be about 3-4.
Different varieties and brands of turkey will have varying results.
To ensure that you get a good estimate for your needs, measure out the 2 ounces first before slicing your turkey. You should also consider buying pre-sliced deli meat or purchase and use a handheld slicer that allows you to adjust the thickness of each slice.
Doing this will help guarantee that you always have just enough turkey in each serving.