Tex. R. App. P. 41.2

As amended through March 23, 2020
Rule 41.2 - Decision by En Banc Court
(a) Constitution of En Banc Court. An en banc court consists of all members of the court who are not disqualified or recused and - if the case was originally argued before or decided by a panel - any members of the panel who are not members of the court but remain eligible for assignment to the court. A majority of the en banc court constitute a quorum. A majority of the en banc court must agree on a judgment.
(b) When En Banc Court Cannot Agree on Judgment. If a majority of an en banc court cannot agree on a judgment, that fact must be certified to the Chief Justice of the Supreme Court. The Chief Justice may then temporarily assign an eligible justice or judge to sit with the court of appeals to consider the case. The reconstituted court may order the case reargued.
(c) En Banc Consideration Disfavored. En banc consideration of a case is not favored and should not be ordered unless necessary to secure or maintain uniformity of the court's decisions or unless extraordinary circumstances require en banc consideration. A vote to determine whether a case will be heard or reheard en banc need not be taken unless a justice of the court requests a vote. If a vote is requested and a majority of the court's members vote to hear or rehear the case en banc, the en banc court will hear or rehear the case. Otherwise, a panel of the court will consider the case.

Tex. R. App. P. 41.2