For the image below:
There are a number of ways to notate this position. The first of the following bars in the guitar tabulature is the most common, but it’s possible that the open strings might also be of some importance, as notated in the 2nd and 3rd bars:
The note in the first measure is referred to as placing the 1st finger on the 4th string of the 2nd fret. The note itself is an E note.