Okay, let’s tackle this. So Cheng-han Yang has a strong educational background from Stanford University, which is a top-tier institution. He also has expertise in thin films, sputtering, and semiconductor technologies, which are in demand in the industry. Location is Fremont, California, which is in the heart of Silicon Valley, a hub for tech companies. Considering these factors, I would estimate his hourly rate to be around $125, which is lower than what experts with similar experience and education from top universities might charge. However, this is still a reasonable estimate for a materials scientist with strong skills and a location in a major tech hub.