Prerequisites for Stack ether channel between 2960xr and 2960x.If any one can please share sample configuration etc.iso version should be same between both stack or can be diff and so on.
You can only create mixed stacks with Catalyst 2960-X or 2960-S switches (up to four switches). You cannot create mixed stacks with other switches. Catalyst 2960-XR switches cannot be added to mixed stacks. They can only stack with other Catalyst 2960-XR switches.
here is stacking guidelines : (Look at section - Stack Guidelines)