I find is best to add a new empty layer on top and set the clone stanp to sample layer and below a clone into the empty layer. That way nothing in changed on the image layer you can adjust what you have cloned using all Photoshop features and blent it into the image the image layer remain unchanged nothing is destroyed in it.
The clone stamp tool can rotate it's output and scale it's output. This is shown in a video on YouTube (the wrong way to explain this because one cannot get to a point on a timeline where either feature is explained).
When will Abobe publish a reference book? Without this book, Photoshop is an unfinished product. A manual is REQUIRED.
You cannot automatically rotate the tool's output, but you can manually do this. You can also scale the tool's output. How? I don't know. I can't find that info on the timeline of a 43 minute video, nor can many others.
WHERE IS THE MANUAL?
Yes the tool can not be rotated. However as you are using the tool you can zoom in and out change the tip size any rotate the image with touch gestures or the Rotate tool.
Photoshop Manual is hopelessly not up to data and the online guide version is not much better.