You can copy-and-paste special characters directly into a text object from a text editor such as MS Word. Alternatively, you can insert the hex character reference into the XML source for the applicable text object instance. For example, to add a copyright symbol, go to the XML Source tab and insert the reference © into the XML node <value><text>Foobar©</text></value>.
I tried your approach and the superscript showed up accuratley in the LiveCycle Designer. But when i generate the PDF from the LC server it is still showing the Superscript in plain text. Is there anything we need to do additionally.
Is your field rich text or plain text
Yes, this Text Field is set to Rich Text format but still does not work.