Ancient Coin Identification And Cleaning?

Welcome to CCF! Yes, I think it's Constantius II, reverse military standard between two soldiers, mint mark TRS with palm branch. You could have fun cleaning it if you want but it won't increase it's value. A lot of ancient coins are carefully cleaned. Do not overly clean it, do not take off the original patina down to bare metal, that would be bad. There's posts here and on the internet how to clean ancient coins. Well circulated late Roman bronze coins are very common, not worth much in the condition yours is in, worn and clipped. You could search ebay sold listings for prices, some are sold in multiple coins lots which collectors clean and sort through. No need to do an XRF, these are copper/bronze.

There are internet sites about ancient coins with lots of info. Here is a coin like yours I think on Vcoins.com from a dealer. It shows the reference number from the book volumes Roman Imperial Coins, RIC 82s.