What is the test for substantial evidence in the context of review for the purpose of establishing that substantial evidence?

^3. Generally, upon review for substantial evidence, "the power of an appellate court begins and ends with the determination as to whether, on the entire record, there is substantial evidence, contradicted or uncontradicted, which will support the determination [of the trier of fact], and when two or more inferences can reasonably be deduced from the facts, a reviewing court is without power to substitute its deductions for those of the [trier of fact]." (Bowers v. Bernards (1984) 150 Cal.App.3d 870, 873-874, italics omitted.)