"The Second Epistle to the Corinthians" [The New International Greek Testament Commentary] by Murray J. Harris
"2 Corinthians" [The NIV Application Commentary] by Scott J. Hafemann
"The Second Epistle To The Corinthians" [The New International Commentary on the New Testament] by Paul Barnett
"Conflict & Community In Corinth: A Socio-Rhetorical Commentary on 1 and 2 Corinthians" by Ben Witherington III
"The Second Epistle To The Corinthians" [Harper's New Testament Commentaries] by C. K. Barrett
"An Exposition of the Second Epistle to the Corinthians" [Thornapple Commentaries] by Charles Hodge
"2 Corinthians" [Word Biblical Commentary] Volume 40 by Ralph P. Martin
"2 Corinthians: An Exegetical and Theological Exposition of Holy Scripture" by David E. Garland [The New American Commentary]
"2 Corinthians" [Tyndale New Testament Commentaries] by R. V. G. Tasker
"The Second Epistle To The Corinthians" [The New International Commentary On The New Testament] by Philip E. Hughes
"The Message Of 2 Corinthians" by Paul Barnett [The Bible Speaks Today]
I could list more commentaries in our library on Second Corinthians but the ones listed our worth checking out when you are reading or studying The Second Letter To The Corinthians. I also recommend this New Testament study on Second Corinthians-
"Paul, Moses, And The History Of Israel: The Letter/Spirit Contrast and the Argument from Scripture in 2 Corinthians 3" by Scott J. Hafemann.
Also check out these books on Second Corinthians-
"Suffering & Ministry in the Spirit: Paul's Defense of His Ministry in II Corinthians 2:14-3:3" by Scott J. Hafemann
"From Triumphalism to Maturity: An Exposition of 2 Corinthians 10-13" by Donald A. Carson
"Meaning And Truth In 2 Corinthians" by Francis Young & David F. Ford
Many years ago when I did my ministerial internship I taught an Adult Sunday School class on Second Corinthians. Ever since I taught that Sunday School class Second Corinthians has been one of my favorite Pauline epistles (along with Romans and Galatians).
It is going on 11:10 AM Sunday late morning. I will close to drift.