Admit to your own mistakes
According to LeadershipNow.com, an authentic manager (or any other person) must first of all be able to acknowledge their own mistakes. Do not pretend you are never wrong.
Do not pretend you know everything best
An authentic leader has no problem admitting they do not know something, or that someone else is better at something. If you are always trying to make out you know everything best, not only will you seem inauthentic but also look like someone with low confidence.
Be transparent in communication with subordinates
When communicating with subordinates, either passing on information from company management or talking to them as part of your everyday work, you must always be absolutely transparent and open. Never talk vaguely, nor employ a misleading, political style of communication.
Focus on your strengths
A person seems most authentic when they are doing something they enjoy and do not need to pretend anything. Therefore you should focus on your strengths, develop them, and use them as much as possible in your everyday work.
Follow the same rules you demand from your team members
Nothing threatens the rapport between manager and subordinates like a situation in which a manager demands something from the workers, yet fails to follow the rules themselves. Serve as a role model and do not try to circumvent your own rules or those of management in any way.