Returns the base-2 logarithm of the given complex number.

**Sample Usage**

IMLOG2("2i")

IMLOG2(C5)

**Syntax**

IMLOG2(complex_number)

- complex_number - The complex number whose base-2 logarithm is to be computed.

**Examples**

IMLOG2("2i") returns a value of 1+2.26618i.

IMLOG2(C5) returns the base-2 logarithm of the complex number in cell C5.