Name the layers of plasma membrane as proposed by Danielli-Davson.

Explanation

### Step-by-Step Solution:

1. **Identify the Scientists and Year**: The model of the plasma membrane was proposed by scientists Danielli and Davson in the year 1935.

2. **Understand the Structure of the Plasma Membrane**: According to the Danielli-Davson model, the plasma membrane consists of four layers.

3. **Detail the Layers**: The four layers are composed of:
- **Two Phospholipid Layers**: These form the outer and inner layers of the membrane.
...