Xerox CopyCentre C35 Quick Reference Manual page 55

Use this option for 2 sided originals and 1 sided copies are required.
2 1 Sided
This option produces 1 sided copies from 2 sided originals and rotates every second
2 1 Sided,
side image. It should be used for "head to toe" orientation or calendar style originals,
Rotate Side 2
to ensure the output images are all in the same orientation.
Page 4-6 Quick Reference Guide