# Linked objects with a rotation offset?

I have 2 linked objects, and I want them to retain the same mesh data, but, on the object level, I want one to have a rotation different than that of the other one. e.g, I want object 1 to have no rotation (at the object level, at least), and I want the second one to be rotated 45 degrees on the z axis. Also, I want it so that when I rotate object 1, object 2 also gets rotated. So, if I rotate object 1 10 degrees on the z axis, then object 2 should be rotated 55 degrees. Is there any way to do this?

In 2.8x, you can apply a Copy Rotation constraint and change the Mix option to Add. This will allow you to apply an offset rotation on the object who has the constraint applied.