How to make button rotate when another button is pressed?

Im trying to make a stop button for my play sound button, this button would be behind the play sound button (the big yellow one in the picture) and it would pop/rotate to the position in the picture when the sound is playing and when the sound stops it would rotate back to its normal postion which is hidden behind the play sound button.

How can I make this happen, im still pretty new to unity and im trying to learn more of it. Any help will be much appreciated and I can provide you with more information and pictures if needed.

Thank you!