Oct 21 (Reuters) - Concordia International Corp CXR.TO :
* Concordia international Corp. announces CEO transition plan
* Says CEO Mark L. Thompson resigned
* Says a search process for a new CEO is underway
* Thompson will also step down from board of directors, where he serves as Chairman, when a successor has been appointed Source text for Eikon: ID:nPn1BjkWha Further company coverage: CXR.TO