A lawyer may interview ex parte a client's employee concerning litigation with the employee's former employer, subject to the limits recognized in Lang v. Superior Court, 170 Ariz. 602, 826 P.2d 1228 (App. 1992). In interviewing an employee in these circumstances, the lawyer must also comply with other applicable ethical rules in addition to ER 4.2, particularly ERs 4.3 and 4.4. [ERs 4.2, 4.3, 4.4]