An oil tanker collides into an iceberg off of the coast of Alaska, causing an oil spill that acts like a thin film. The crew notices that the oil spill is shimmering rainbow colours, especially yellow light with a wavelength of 560 nm. You can assume the thin film setup includes air (n = 1.00), followed by oil (n = 1.52), followed by water (n = 1.33). What is the approximate thickness of the thin film (oil layer) that would cause constructive interference of yellow light (560 nm)?